Valve-tappet



EDWAR) C. SENKPIEL, OF DETROIT, MICHIGAN.

VALVETAPPET.

Application filed March 5, 1919.

To all whom t may concern:

Be it known that I, EDWARD C. SENKPIEL, a citizen of the United States, residing at Detroit, county of lVayne, State of Michigan, have invented a new and useful Improvement in Valve-Tappets, of which the following is a specification.

-This invention" relates to (valve tappets and has forl its object a valveY tappet that is practically noiseless and which can 'be completely assembled and, be handled as a unit in stock. As is well understood, clearance must always be provided between the valve tappet and the valve stem or the push rod; otherwise when they expand under the heat of the engine the valve will ride. This clearance, of course, results in the clicking of the valve tappets, which is so noticeable in many motors.

It is the object of this invention to deaden that olif-king and invert the position of the clearance space from the position above thel crank case to a position in the crank case.

It is not broadly new to have a two-part teleseoping. valve tappet in which lthe telescoping parts are spaced by a, spring and both ends of the tappet are caused to follow the respective parts that they contact. How ever, a very serious objection to these tappets so constructed has been that Ithey Ihave had to be assembled on the job, that is, the several parts of the tappet have to either be put. together and linally assembled vin the engine or else they have to be assembled in the bushing and then the bushing assembled into the engine. Both of these objections are obviated in the construction that I am about to describe.

In the drawings,-

The ligure is a longitudinal section of the tappet.

a designatesthecam shaft; 5 the cam; o

the top of the crank case; d the usual tappet bushing; e the 'bottom of the valve stem or the push rod. The tappet is made in the form of a pair of telescopiug members. One is a sleeve j which is carefully fitted into the bushing l and guided therein. This sleeve f is provided with two bores from opposite ends forming a shoulder .where they meet.

One bore is partially screw-threaded to receive the cap screw g with a hexagonal head and partly plain to form. a valvechamber L. The jam nut 1I een be used to set the cap screw to any position of adjustment. Through the lower plain bore of reduceddi- Specification of Letters Patent.

Patented oct. 14, 191e. sensi N0. 280,697.

j of the other telescoplng member, which is provided with a head c that rides the cam b and also is adapted -to engage the end of the sleeve f to raise the valve stem or push rod e. The. spring Z is entirely housed within the chamber z and serves to push the two members apart and always keep the hexagonal head of the screw g against the valve stem or push rod e and the head le of the smaller telescoping member on the surface of the cam. Hence when the valve is closed, the clearance space will be at m between the lower end of the sleeve and the head k of the smaller teleseoping mem- Here thevhead is completely bathed in oil due to the oilniist that always exists in the crank case where the splash system of lubrication is used. This oil serves to deaden rthe clicking sound when ythe undercut portions of the head strike the end of the sleeve. Furthermore, the point of contactis carried cleardown into the crank case, whose thick walls materially deaden the sound. If any oil pumps up into the 'spring chamber ,t it will be ofno consequence as it can get no farther.

A very fundamental advantage of this type of noiseless valve tappet is not only its simplicity butthe fact that the' head of the stein j may be upset as at n to tie the parts completely togetherso that they exist as a unit, can be carried in stock as a unit, and lifted out ofa job as a unit without in any way interfering with the bushing or the crank ease. The upsetting may obviously be done by placing the stem of the smallery telescoping member in the sleeve and striking it with an instrument, such asa punch, before the screw g is put in place, the punch entering through the screw hole. The spring may then vbe put in place and the screw g ameter runs the stem put in place, which completely assembles the.

entire two-part tappet.

What I claim is:

l. A valve tappet, having in combination, a sleeve provided with a shoulder on its interior, a closure for the outer end of the sleeve, ya telescoping member provided with a stem slidable in the inner end of the sleeve and by the said shoulder, the extreme inner end of the stem being upset after it has been passed therein, a head on the other end of the stem adapted when the telescoping-member is lifted to contact the end ofthe said sleeve, and a spring between the closure'and the end of the stem.

A valve. tappet, having in combination, asleeve screw-threaded at one end and provided with a shoulder near the other end, an adjusting screw runnin in the threads 5 of the screw-threaded enc a teleseoping member provided with a stem sliding `in the the other end of the sleeve an having a head adapted to Contact the end of the sleeve lwhen the teleseoping member is lifted, the inner end 0i the stem being upset to retain the member in the sleeve after it has been inserted, and a spring between the end of the screw and the end of the stem.

3. A valve tappet, comprising a sleeve interiorly screw-threaded at one end and having a smooth bore at the opposite end, a tele scoping member slidable in the smooth bore, 'a shoulder on the interior of the sleeve, the end of the teleseoping member being upset.

after it has passed the shoulder, a screw run into the threaded end of the sleeve, :and

spring between the end of the screw 'and the end of the teleseoping member` 4. A valve tappet, having a sleeve having a bore of large diameter upon the outer end and a bore o smaller diameter in the inner end forming an intervening shoulder, a portion of the bore of larger diameter eing screw-threaded, a telescoping member fitted into the bore of smaller' diameter and having its head upset to assemble 1t therein, a screw run into the threads or' the lar er diameter, and an intervening spring etween the end of the screw and the end et the telescoping meirrer.

ln witness w ereof l. have hereunto set my hand on the 27th day of February, 1919.

EDWARD C. SENKPIEL 

